Valve-spring holder



L J. BARTENSTEIN. VALVE SPRING HOLDER.

APPLICATION FILED 1u1v 1, 191e.

Patented Dec. 7, 1920.

Jfarlenslczzz UNITED STATES PATENT OFFICE. .i

IOT-IN J. BARTENSTEIN, 0F CLEVELAND, OHIO, ASSIGNOR TO THE FAIRMOUNT TOOL AND FORG-ING CO., A CORPORATION OF OHIO.

VALVE-SPRING HOLDER.

Specification of Letters Patent.

Patented Deo. 7, 1920.

T0 all whom t may concern Be it known that I, JOHN J. BARTEN- STEIN, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have vinvented certain new and useful Improvements in Valve- Spring Holders, of which the following is a specification.

This invention relates to valve spring holders such as are used for compressing and retaining the coiled spring around the valve stem of an internal-combustion engine to permit withdrawal of the spring supporting pin and thereby the removal of the valve.

lIhe main object of the invention is to provide a valve spring holder of simple and practical construction, that is easy to operate for heavy service, and positive in its action in either direction for compressing a spring.

In order that the invention may be clearly understood, the same will be hereinafter fully described in connection with the accompanying drawings, and the novel features thereof will be distinctly pointed out in the appended claims.

In the drawings similar characters of reference designate corresponding parts.

Figure 1 is a side view of a valve spring holder, made according to my invention, the

same being applied to a valve spring in compressing position,

Fig. 2 is a plan or edge view of the valve spring holder, and

Fig. 3 is a fragmental section illustrating the power applying sleeve rotatably mounted in the head block.

Referring to the drawings, 1 represents the valve of an internal-combustion engine, 2 the stem thereof, and 3 the coiled spring around the valve stem. The pin 4 supports a washer 5, which carries the coiled spring for exerting the necessary tension on the valve. When it is desired to remove the valve for regrinding, or in replacing the valve, it is necessary to relieve the tension of the coiled spring to permit the withdrawal of the pin 4, and the holder hereinafter described is designed for accomplishing this purpose.

The holder consists of a pair of complemental levers 6 and 7, having their ends pivoted at 8 between pairs of lugs 9, which are formed integrally with a head block l0. The free ends of the levers 6 and 7 are flattened and bifurcated, as indicated at 11, for straddling the valve stem, and said ends are made wedge shaped at 12 to permit easy and quick insertion thereof for releasing the tension of the coiled spring. The levers 6 and 7 are actuated in either direction, to draw together their free ends or to force them apart, for compressin the valve spring. To the levers 6 and g?, at 13, are pivotally connected pairs of toggle links 14, which have their inner ends pivoted at 15 to the flat cross-head 16 of a square-threaded screw 17. Said feed screw is forced longitudinally in either direction by rotating a sleeve 18, which is rotatably mounted in an opening 19 of the head block 10. The sleeve 18 isprovided at 20 with threads for acting upon the screw 17, and is of increased diameter at its inner end 21 for forming a shoulder 22. To the outer proface 26 of the head block, and this retains` the sleeve 18 in said block.

The valve spring holder herein described is positively operated by turning the handle 25, either to draw together or force apart the free ends of the levers 6 and 7 for compressing a valve spring, and then holding it to relieve the tension thereof on the spring supporting pin to permit withdrawal of the same. The turning of the handle, rotates the sleeve 18, which reciprocates the screw 17, and this acting upon the toggle links 14C forces the levers inwardly or outwardly according to the direction of rotation of the handle.

It will be understood that slight changes in the details of construction may be made so long as they do not depart from the scope of the appended claims.

Having fully described my invention what I claim is:

1. In a valve spring holder, the combination of a pair of levers, .a head block, the levers being pivotally connected to the head block, a screw, toggle links connecting the screw to the levers, a sleeve rotatably mounted in the head block, means for preventing longitudinal movement of the sleeve in the head block, the sleeve being threaded for receivingI said screw, and a handle for turning the sleeve, substantially as described. Y

2. In a valve spring holder, the combination of a pair of levers, a head block, the levers being pivotally connected to the head block, a screvv, toggle links connecting the screw to the levers, a sleeve rotatably mounted in the head block, `the sleeve being l0 threaded for receiving said screw, the inner end of the sleeve being of increased dialneter to form a shoulder, a handle, the handle having a shank, the shank of the handle being iXed to 'the outer end of said sleeve, and the shank being of greater diameter than the sleeve for overlapping the end of the head block t0 retain the sleeve in position, substantially as described.

'In testinion whereof I aiix my siwn'ature.

oHN J. BARTENSTEIN. 

